منابع مشابه
Botanical ratchets.
Ratcheting surfaces are a common motif in nature and appear in plant awns and grasses. They are known to proffer selective advantages for seed dispersion and burial. In two simple model experiments, we show that these anisotropically toothed surfaces naturally serve as motion rectifiers and generically move in a unidirectional manner, when subjected to temporally and spatially symmetric excitat...
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Supplementary data tml http://rspb.royalsocietypublishing.org/content/suppl/2009/03/06/rspb.2008.1685.DC1.h "Data Supplement" References http://rspb.royalsocietypublishing.org/content/276/1665/2243.full.html#ref-list-1 This article cites 15 articles, 2 of which can be accessed free Subject collections (129 articles) biophysics (54 articles) biomaterials Articles on similar topics can be f...
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We introduce a new class of problems: computing the set of all the convex combinations of sites when their position is uncertain and depends linearly on shared parameters which vary according to a uniform distribution. The boundary of the set, called the uncertainty envelope, is useful in optimizing processes where there is uncertainty on the site positions and the objective functions. We provi...
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Drugs used to treat anxiety have many negative side effects including addiction, depression, suicide, seizures, sexual dysfunction, headaches and more. Anxiolytic medications do not restore normal levels of neurotransmitters but instead manipulate the brain chemistry. For example, selective serotonin reuptake inhibitors (SSRIs) prevent the reuptake of serotonin from the synapse allowing seroton...
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Because botanical taxonomies are prototypical classifications it would seem that it should be easy to formalize them as concept lattices or type hierarchies. On closer inspection, however, one discovers that such a formalization is quite challenging to obtain. First, botanical taxonomies consist of several interrelated hierarchies, such as a specimen-based plant typology, a name hierarchy and a...
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ژورنال
عنوان ژورنال: Sibbaldia: the International Journal of Botanic Garden Horticulture
سال: 2009
ISSN: 2513-9231
DOI: 10.24823/sibbaldia.2009.168